US20020007878A1 - Carbide dispersed, strengthened copper alloy - Google Patents
Carbide dispersed, strengthened copper alloy Download PDFInfo
- Publication number
- US20020007878A1 US20020007878A1 US09/933,071 US93307101A US2002007878A1 US 20020007878 A1 US20020007878 A1 US 20020007878A1 US 93307101 A US93307101 A US 93307101A US 2002007878 A1 US2002007878 A1 US 2002007878A1
- Authority
- US
- United States
- Prior art keywords
- carbide
- dispersing agent
- set forth
- copper
- magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052802 copper Inorganic materials 0.000 claims abstract description 25
- 239000002270 dispersing agent Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 229910003470 tongbaite Inorganic materials 0.000 claims abstract description 9
- 150000001247 metal acetylides Chemical class 0.000 claims abstract description 8
- 229910003468 tantalcarbide Inorganic materials 0.000 claims abstract description 8
- 239000000470 constituent Substances 0.000 claims abstract description 6
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910039444 MoC Inorganic materials 0.000 claims abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims abstract description 5
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims abstract description 5
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 239000004020 conductor Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 3
- 229910003178 Mo2C Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 241001124569 Lycaenidae Species 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 235000014987 copper Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005551 mechanical alloying Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
Definitions
- the present invention relates to a strengthened copper including a dispersed carbide.
- the strengthened copper including dispersed particles consisting of alumina or the like.
- the strengthened copper may be called a particle dispersed, strengthened copper.
- the strengthened copper is produced basically by a process of powder metallurgy. For example, regarding an oxide strengthened copper, a powder copper raw material is mixed with copper oxide powder. Subsequently, the particles of the copper oxide powder can be evenly dispersed in matrices of the copper elements during oxidation due to the copper oxide powder. Meanwhile, a carbide dispersed copper is obtained by mixing a powder copper raw material with a carbide in a mechanical alloying process.
- Japanese Patent Laid-open No. 2-19177 proposes a method, in which carbide particulates are added in pure copper and they are molten by heating. The melt is mechanically stirred at a high speed of 1500 rpm and is cooled until solidification of the melt. This forcibly evenly disperses the carbide particulates in matrixes of copper elements.
- stirring apparatuses are high in installation cost, and moreover, this method provides only a product having a low tensile strength of the order of 400 N/mm 2 (newton/square millimeter).
- an object of the present invention is to provide a carbide dispersed, strengthened copper alloy that has a high tensile strength at a high temperature (400° C.) and has a high electrical conductivity. Furthermore, the alloy is not expensive in production.
- a production method of a carbide dispersed, strengthened copper alloy includes the steps of: adding carbide particles and a dispersing agent into a bath containing a molten-metal that includes copper as a major constituent, and stirring said molten-metal in the bath.
- a carbide dispersed, strengthened copper alloy according to the invention includes copper as a major constituent, carbide particles, and a dispersing agent.
- the carbide particles may consist of one or more carbides selected from chromium carbide, tungsten carbide, molybdenum carbide, and tantalum carbide.
- the dispersing agent may consist of one or more elements selected from magnesium, chromium, silicon, and alminium.
- the carbide particles preferably have a smaller wetting angle to the molten-metal including copper as a major constituent.
- carbide particles there are chromium carbide (for example, Cr3C2), tungsten carbide (for example, WC), molybdenum carbide (for example, Mo2C), and tantalum carbide (for example, TaC).
- these carbides each preferably have a specific gravity dose to that of the molten-metal alloy.
- the specific gravity of the basic molten-metal alloy is around 8.9.
- Table 1 shows wetting angles of the carbides to the molten copper, and shows the specific gravity values thereof (based on a technical literature).
- Table 1 shows wetting angles of the carbides to the molten copper, and shows the specific gravity values thereof (based on a technical literature).
- TABLE 1 Cr 3 C 2 WC Mo 2 C TaC Wetting Angle 47° 7 to 30° 0 to 18° 36 to 75° Specific Gravity 6.7 15.6 9.1 14.5
- Trichrominum dicarbide (Cr3C2) has the most preferable character among carbides shown in Table 1.
- the quantity of the added carbides is preferably not less than 0.5 and not more than 20 weight units to the molten copper of 100 weight units.
- a carbide weight unit less than 0.5 can not achieve a satisfactory effect in carbide strengthening, while a carbide weight unit more than 20 significantly decreases the product alloy in formability.
- the invention requires to add a dispersing agent in the molten-metal.
- the dispersing agent acts to obtain a carbide dispersed, strengthened copper alloy in which the carbide particles are sufficiently evenly dispersed.
- the dispersing agent one or more elements are selected from magnesium, chromium, silicon, and alminium. In particular, magnesium can attain the most advantageous effect among these dispersing agents.
- the quantity of the added dispersing agent is preferably not less than 0.1 and not more than 2 weight units to the molten copper of 100 weight units.
- a dispersing agent weight unit less than 0.1 can not achieve a satisfactory agent effect, while a dispersing agent weight unit more than 2 makes the product alloy brittle to decrease a shock-resistant performance thereof.
- the stirring can be accomplished by an ordinary stirring means (such as mechanical means or electromagnet means), and does not require to operate at a high speed. Such stirring means are not expensive. After both the carbide and the dispersing agent are added in the molten-metal, the stirring operation continues and stops just before a cast ingot is obtained.
- an ordinary stirring means such as mechanical means or electromagnet means
- carbide dispersed, strengthened copper alloy can be formed into a practical electric conductor material by a rolling or drawing process. It is noted that the above-mentioned cast ingot does not need hot extrusion forming.
- carbide particles (5 ⁇ m particle diameter) and a dispersing agent consisting of magnesium, which satisfy weight ratios shown in Table 2, were added in a molten copper (1200° C.).
- each molten copper was continuously stirred by hand so as to evenly disperse the carbide particles in the melts.
- the molten-metal was filled into a mold having a 15 mm diameter so as to obtain an ingot. After cooled, the ingots each were formed into an electric conductor having a 1 mm diameter by rolling and drawing process.
- the electric conductor to which trichrominium dicarbide was added has a tensile strength of 649 N/mm 2 at 400° C., which is greater than twice of the strength of 301 N/mm 2 of the pure copper conductor at the same high temperature. Moreover, the electric conductor has a satisfactory conductivity which is 60% of that of the pure copper conductor.
- the carbide dispersed, strengthened copper alloys according to the invention do not require a specialized stirring apparatus and can be produced at a lower cost to advantageously provide electric conductors having a sufficient strength at a high temperature (400° C.).
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
A carbide dispersed, strengthened copper alloy includes copper as a major constituent, carbide particles, and a dispersing agent. The carbide particles consist of one or more carbides selected from chromium carbide, tungsten carbide, molybdenum carbide, and tantalum carbide. The dispersing agent consists of one or more elements selected from magnesium, chromium, silicon, and aluminum.
Description
- 1. Field of the Invention
- The present invention relates to a strengthened copper including a dispersed carbide.
- 2. Prior Art
- To provide an electrically conductive material having a sufficient strength in a high temperature, there has been used a strengthened copper including dispersed particles consisting of alumina or the like. The strengthened copper may be called a particle dispersed, strengthened copper. The strengthened copper is produced basically by a process of powder metallurgy. For example, regarding an oxide strengthened copper, a powder copper raw material is mixed with copper oxide powder. Subsequently, the particles of the copper oxide powder can be evenly dispersed in matrices of the copper elements during oxidation due to the copper oxide powder. Meanwhile, a carbide dispersed copper is obtained by mixing a powder copper raw material with a carbide in a mechanical alloying process.
- Thus produced copper alloys are formed into electric conductors in desired product sizes by the plastic forming of hot extrusion after solidification thereof.
- However, these known strengthened coppers have been little commercially produced because of a significantly high production cost due to their long, complicated production processes.
- To solve the problem, modified molding methods have been proposed. However, a satisfactory result has not been attained. For example, Japanese Patent Laid-open No. 2-19177 proposes a method, in which carbide particulates are added in pure copper and they are molten by heating. The melt is mechanically stirred at a high speed of 1500 rpm and is cooled until solidification of the melt. This forcibly evenly disperses the carbide particulates in matrixes of copper elements. However, such stirring apparatuses are high in installation cost, and moreover, this method provides only a product having a low tensile strength of the order of 400 N/mm 2 (newton/square millimeter).
- In view of the problems in the prior arts, an object of the present invention is to provide a carbide dispersed, strengthened copper alloy that has a high tensile strength at a high temperature (400° C.) and has a high electrical conductivity. Furthermore, the alloy is not expensive in production.
- To achieve the object, a production method of a carbide dispersed, strengthened copper alloy according to the invention includes the steps of: adding carbide particles and a dispersing agent into a bath containing a molten-metal that includes copper as a major constituent, and stirring said molten-metal in the bath.
- Furthermore, a carbide dispersed, strengthened copper alloy according to the invention includes copper as a major constituent, carbide particles, and a dispersing agent. The carbide particles may consist of one or more carbides selected from chromium carbide, tungsten carbide, molybdenum carbide, and tantalum carbide. The dispersing agent may consist of one or more elements selected from magnesium, chromium, silicon, and alminium.
- In the invention, the carbide particles preferably have a smaller wetting angle to the molten-metal including copper as a major constituent. As such carbide particles, there are chromium carbide (for example, Cr3C2), tungsten carbide (for example, WC), molybdenum carbide (for example, Mo2C), and tantalum carbide (for example, TaC).
- Moreover, these carbides each preferably have a specific gravity dose to that of the molten-metal alloy. The specific gravity of the basic molten-metal alloy is around 8.9.
- Table 1 shows wetting angles of the carbides to the molten copper, and shows the specific gravity values thereof (based on a technical literature).
TABLE 1 Cr3C2 WC Mo2C TaC Wetting Angle 47° 7 to 30° 0 to 18° 36 to 75° Specific Gravity 6.7 15.6 9.1 14.5 - Trichrominum dicarbide (Cr3C2) has the most preferable character among carbides shown in Table 1.
- In addition, the quantity of the added carbides is preferably not less than 0.5 and not more than 20 weight units to the molten copper of 100 weight units. A carbide weight unit less than 0.5 can not achieve a satisfactory effect in carbide strengthening, while a carbide weight unit more than 20 significantly decreases the product alloy in formability.
- The invention requires to add a dispersing agent in the molten-metal. The dispersing agent acts to obtain a carbide dispersed, strengthened copper alloy in which the carbide particles are sufficiently evenly dispersed. As the dispersing agent, one or more elements are selected from magnesium, chromium, silicon, and alminium. In particular, magnesium can attain the most advantageous effect among these dispersing agents.
- The quantity of the added dispersing agent is preferably not less than 0.1 and not more than 2 weight units to the molten copper of 100 weight units. A dispersing agent weight unit less than 0.1 can not achieve a satisfactory agent effect, while a dispersing agent weight unit more than 2 makes the product alloy brittle to decrease a shock-resistant performance thereof.
- In the invention, it is necessary to stir sufficiently the molten-metal that has been added both the carbide and the dispersing agent. The stirring can be accomplished by an ordinary stirring means (such as mechanical means or electromagnet means), and does not require to operate at a high speed. Such stirring means are not expensive. After both the carbide and the dispersing agent are added in the molten-metal, the stirring operation continues and stops just before a cast ingot is obtained.
- Thus obtained carbide dispersed, strengthened copper alloy can be formed into a practical electric conductor material by a rolling or drawing process. It is noted that the above-mentioned cast ingot does not need hot extrusion forming.
- Next, a plurality of embodiments of a carbide dispersed, strengthened copper alloy according to the invention will be discussed.
- To obtain the plurality of embodiments, carbide particles (5 μm particle diameter) and a dispersing agent consisting of magnesium, which satisfy weight ratios shown in Table 2, were added in a molten copper (1200° C.). At the same time, each molten copper was continuously stirred by hand so as to evenly disperse the carbide particles in the melts. Then, the molten-metal was filled into a mold having a 15 mm diameter so as to obtain an ingot. After cooled, the ingots each were formed into an electric conductor having a 1 mm diameter by rolling and drawing process.
- These electric conductors were checked in mechanical and electrical characteristics at a high temperature (400° C.). The results are also shown in Table 2.
TABLE 2 Comparative Example Example Example Example Example 1 2 3 4 Pure 100 100 100 100 100 Copper Cr3C2 10 WC 10 Mo2C 10 TaC 10 Mg 0.5 0.5 0.5 0.5 0.5 Tensile 301 649 338 321 339 Strength at 400° C. (N/mm2) Conduct- 74.9 60.9 74.1 78.4 62.6 ivity (% to Pure Cu) - The resulted data in Table 2 show that the electric conductors made of the carbide dispersed, strengthened copper alloys according to the invention have a sufficient strength at a high temperature (400° C.), and also has a desired electrical conductivity.
- Particularly, the electric conductor to which trichrominium dicarbide was added has a tensile strength of 649 N/mm 2 at 400° C., which is greater than twice of the strength of 301 N/mm2 of the pure copper conductor at the same high temperature. Moreover, the electric conductor has a satisfactory conductivity which is 60% of that of the pure copper conductor.
- The carbide dispersed, strengthened copper alloys according to the invention do not require a specialized stirring apparatus and can be produced at a lower cost to advantageously provide electric conductors having a sufficient strength at a high temperature (400° C.).
Claims (12)
1. A production method of a carbide dispersed, strengthened copper alloy comprising the steps of:
adding carbide particles and a dispersing agent into a bath containing a molten-metal that includes copper as a major constituent, and
stirring said molten-metal in the bath.
2. A production method set forth in claim 1 , said carbide particles consist of one or more carbides selected from chromium carbide, tungsten carbide, molybdenum carbide, and tantalum carbide.
3. A production method set forth in claim 1 , said carbide particles consist of trichrominium dicarbide.
4. A production method set forth in claim 1 , said dispersing agent consists of one or more elements selected from magnesium, chromium, silicon, and alumimum.
5. A production method set forth in claim 2 , said dispersing agent consists of magnesium.
6. A production method set forth in claim 3 , said dispersing agent consists of magnesium.
7. A carbide dispersed, strengthened copper alloy comprising copper as a major constituent, carbide particles, and a dispersing agent.
8. An alloy set forth in claim 7 , said carbide particles consist of one or more carbides selected from chromium carbide, tungsten carbide, molybdenum carbide, and tantalum carbide.
9. An alloy set forth in claim 7 , said carbide particles consist of trichrominium dicarbide.
10. An alloy set forth in claim 7 , said dispersing agent consists of one or more elements selected from magnesium, chromium, silicon, and aluminum.
11. An alloy set forth in claim 8 , said dispersing agent consists of magnesium.
12. An alloy set forth in claim 9 , said dispersing agent consists of magnesium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/933,071 US20020007878A1 (en) | 1997-07-29 | 2001-08-21 | Carbide dispersed, strengthened copper alloy |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9203143A JPH1150172A (en) | 1997-07-29 | 1997-07-29 | Carbide dispersion strengthened copper alloy material |
| JP9-203143 | 1997-07-29 | ||
| US09/122,869 US6299708B1 (en) | 1997-07-29 | 1998-07-27 | Carbide dispersed, strengthened copper alloy |
| US09/933,071 US20020007878A1 (en) | 1997-07-29 | 2001-08-21 | Carbide dispersed, strengthened copper alloy |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/122,869 Continuation US6299708B1 (en) | 1997-07-29 | 1998-07-27 | Carbide dispersed, strengthened copper alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20020007878A1 true US20020007878A1 (en) | 2002-01-24 |
Family
ID=16469135
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/122,869 Expired - Lifetime US6299708B1 (en) | 1997-07-29 | 1998-07-27 | Carbide dispersed, strengthened copper alloy |
| US09/933,071 Abandoned US20020007878A1 (en) | 1997-07-29 | 2001-08-21 | Carbide dispersed, strengthened copper alloy |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/122,869 Expired - Lifetime US6299708B1 (en) | 1997-07-29 | 1998-07-27 | Carbide dispersed, strengthened copper alloy |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US6299708B1 (en) |
| JP (1) | JPH1150172A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218901A (en) * | 2019-07-04 | 2019-09-10 | 江西理工大学 | Twin crystal tungsten carbide collaboration enhancing Cu-base composites and preparation method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2802342A1 (en) * | 2009-06-24 | 2011-01-13 | Third Millennium Metals, Llc | Copper-carbon composition |
| CN103643075B (en) * | 2013-11-29 | 2016-01-20 | 浙江工业大学 | Cu-base composites of nano-particle reinforcement and preparation method thereof |
| CN105220004B (en) * | 2015-09-29 | 2017-12-05 | 河南科技大学 | A kind of copper-based electric contact composite material and preparation method thereof |
| CN106191518B (en) * | 2016-08-09 | 2018-05-18 | 苏州金仓合金新材料有限公司 | A kind of carborundum antimony tin zinc-copper composite material and preparation method for high ferro locomotive |
| RU2715513C1 (en) * | 2019-08-07 | 2020-02-28 | Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" | Method of producing cast composite material based on copper |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199606A (en) * | 1984-10-22 | 1986-05-17 | Hitachi Ltd | Manufacturing method of composite powder |
| JPH0677610B2 (en) | 1988-07-07 | 1994-10-05 | 高圧瓦斯工業株式会社 | Fire extinguisher container valve |
| JPH042416A (en) | 1990-04-17 | 1992-01-07 | Sumitomo Electric Ind Ltd | Electrode wire for wire electric discharge machining |
-
1997
- 1997-07-29 JP JP9203143A patent/JPH1150172A/en active Pending
-
1998
- 1998-07-27 US US09/122,869 patent/US6299708B1/en not_active Expired - Lifetime
-
2001
- 2001-08-21 US US09/933,071 patent/US20020007878A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218901A (en) * | 2019-07-04 | 2019-09-10 | 江西理工大学 | Twin crystal tungsten carbide collaboration enhancing Cu-base composites and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| US6299708B1 (en) | 2001-10-09 |
| JPH1150172A (en) | 1999-02-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |